Prince Konstanty Radziwiłł had two more grandchildren this year, his brother Maciej debuted as a grandpa this year (of Łucja Kastory) and his sister Zofia Maria (b.1959) & her husband Aleksander Andrzej Bocheński (also of noble origin, coat of arms Rawicz, b.1958) parents of seven children, had two more grandchildren this year (their ninth and tenth):

Klara Brzozowska, born on 17 June - third daughter of Klementyna Anna Bocheńska, who will turn 37 in eleven days [their second child and daughter] & her husband Jan Brzozowski (Coat of Arms Belina) who will turn 39 in ten days.

Karl-Anton Koenigs (b. 1980) [oldest child of Countess Ariane of Solms-Laubach (b. 1958) and her late first husband Stephan Koenigs (1952-1985)] & his domestic partner Julia Primus had their second child this year.

A newborn has a sister (b.2015)

For Countess Ariane this year was doubly blessed because her daughter Madeleine (twin sister of Karl-Anton) & her husband Friedrich Oetker also became parents for the second time (of a daughter named Tatiana).

Maďté Morel de Boncourt de Belvalet d'Humeroeuille (*1984), eldest child of Princess Marie-Gabrielle of Arenberg (*1958) and her husband Count Gilles Morel de Boncourt de Belvalet d'Humeroeuille (*1955), and her husband François Stoffels d'Hautefort had their third child, Emmanuel, this year.

Marguerite de Nicola˙ (b.1984) [second of four children and younger daughter of Count Louis Jean de Nicola˙ (b.1949) {himself son of Princess Pia-Maria of Brazil (1913-2000) & her husband Count Rene de Nicola˙ (1910-1954)] & his wife Barbara, nee Countess of Ursel de Bousies (b.1958)] & her husband Alban Miller Mackay (b.1979) had their second child, James, this year.

Marguerite de Nicola˙ (b.1984) [second of four children and younger daughter of Count Louis Jean de Nicola˙ (b.1949) {himself son of Princess Pia-Maria of Brazil (1913-2000) & her husband Count Rene de Nicola˙ (1910-1954)] & his wife Barbara, nee Countess of Ursel de Bousies (b.1958)] & her husband Alban Miller Mackay (b.1979) had their second child, James, this year.

A great joy has come to Prince Charles-Edouard Marie de Broglie-Revel (b.1954) [himself son of Prince Gabriel de Broglie-Revel (b.1931) & his wife Diane, nee Desmier d'Archiac de Bryas (b.1931)]& his wife Laure, nee Mallarde de la Vallende (b.1955); they became double grandparents this year!

Their oldest son (and second child) Geoffroy (b.14 September 1981) & his wife Isaure, nee Desrouusseaux de Medrano, who will turn 34 in nine days had their fifth child, Jacques.

Also their youngest son (and fourth child) Armand (b.5 October 1987) & his wife Marie-Alix, nee Delettrez had their first child, Aurore.

Their firstborn daughter Alienor (b.24 April 1980) is married since 2009 to Benoit de Vulliod (b.11 March 1977); they have a son Celse and a daughter Diane.
Their middle son Ghislain (b.20 January 1985) is married since 2012 to Victoire Tetzlaff.
Their youngest daughter Marie (b.1993) is single.

New double grandpa's only sister Priscilla (b.1955) & her husband Count Eduard de Pradel de Lamaze (b.1954) have three children and seven grandchildren, so for great-grandparents there are 14th and 15th great-grandchildren.

Princess Clara of Altenburg (*1983), third of four children of Prince Johannes of Altenburg (*1949) and his wife Eugenie Fundulus (*1953), and her husband Alessandro Marangoni had their first child, Matteo, this year.

Prince Michał Mikołaj Radziwiłł (b.15 March 1990)[youngest of three children and only son of Prince Jerzy Mikołaj Marcin Radziwiłł (b.1956) & his wife Teresa, nee Kozakiewicz (b.1955)]& his wife Małgorzata, nee Król (b.7 May 1990) had their second child, Helena Małgorzata, in Warsaw on 30 November.

The common ancestors of both new fathers were Prince Maciej Mikołaj Jakub Stanisław Radziwiłł (1873-1920) & his wife Róża Potocka (1878-1931); for Artur Maciej they were great-grandparents, for Michał Mikołaj - great-great-grandparents.

Countess Katharina of Rosenborg (b.1 May 1982) [daughter of Count Ulrik of Rosenborg (b.1950) {himself son of late Count Oluf of Rosenborg (1923-1990) & his first wife, Annie Puggard-Muller (b.1926)} & his late first wife, Tove Waigner-Larssen (1950-2010)] became a mother of twins, Albert and Fiona, this year.
The identity of their father is unknown.

Princess Ida Letizia of Schwarzenberg (b.9 October 1980) [youngest of five children of Prince Erkinger of Schwarzenberg (b.1933) & younger daughter by his current wife, Countess Claudia of Horn zu Brandis (b.1949)] & her husband Baudoin de Troostembergh (b.30 August 1980) became parents of a son, Jean, on 23 October.